I try to get Johnny out for walks on the trail, a black-topped former railroad line, once a day, maybe a mile or so, and up and down the street and to survey the yard also. He LOVES his walks and learned the word "walk" in a few days.
He gets wild if he hasn't had a walk even though he has a fenced in yard, it's not the same as a walk on the trail.
Other dogs also worry me even the ones with their owners. Sometimes owners don't know how their dogs will react to the little, excitable ones.